Woundwood - Woundwood is a
very tough, woody tissue that grows behind callus and replaces it in that
position. When woundwood closes wounds, then normal wood continues to
form. After wounding, callus forms first about the margins of the
wound. Woundwood forms later as the cells become lignified.
Callus is a tissue that is meristematic, low in lignin, and homogenous as to
cell types. Woundwood is not meristematic, is high in lignin, and has
differentiated cells -vessels, fibers, axial and radial parenchyma.
Woundwood is differentiated tissue that has lots of lignin. Click here for info on callus verses woundwood.